Was hoping someone could help me with a small but annoying problem...Each morning and evening when my heating system switches on I can hear a banging noise from the heating pipes. I think it only started recently after I'd bled the air out of all the radiators in the house. Now it will bang for about 10-15 minutes each time the system switches on.

If it's any help, the sound only seems to be coming from one section of piping which is under the floorboards about a meter away from the hot water tank.

Does this sound familiar to anyone, and can it be resolved without tearing up my floor...?